Question

What is constructive interference & destructive interference?

Answer 1

$<b>This is$ called constructive interference. If the two amplitudes have opposite signs, they will subtract to form a combined wavewith a lower amplitude. This is calleddestructive interference. Sound waves with higher amplitudes sound louder than sound waves with lower amplitudes.

Answer 2

Constructive interference is when the crests or the troughs of the waves interfere with the other. Therefore their amplitudes of are added to find the total amplitude. The amplitude of constructive interference is always greater than the amplitude of individual waves.
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Destructive interference is when a crest and a trough interfere with each other. This results in a lower amplitude than those of the original waves.